// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_
#define BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_

#include <stdint.h>

#include <string>

#include "base/base_export.h"

namespace base {
namespace trace_event {

    class BASE_EXPORT MemoryAllocatorDumpGuid {
    public:
        MemoryAllocatorDumpGuid();
        explicit MemoryAllocatorDumpGuid(uint64_t guid);

        // Utility ctor to hash a GUID if the caller prefers a string. The caller
        // still has to ensure that |guid_str| is unique, per snapshot, within the
        // global scope of all the traced processes.
        explicit MemoryAllocatorDumpGuid(const std::string& guid_str);

        uint64_t ToUint64() const { return guid_; }

        // Returns a (hex-encoded) string representation of the guid.
        std::string ToString() const;

        bool empty() const { return guid_ == 0u; }

        bool operator==(const MemoryAllocatorDumpGuid& other) const
        {
            return guid_ == other.guid_;
        }

        bool operator!=(const MemoryAllocatorDumpGuid& other) const
        {
            return !(*this == other);
        }

    private:
        uint64_t guid_;

        // Deliberately copy-able.
    };

} // namespace trace_event
} // namespace base

#endif // BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_
